#51DD9D
Closest named color: Aqua Green (#12E193). oklch(80.5% 0.152 160), rgb(81, 221, 157).
Aa
Black text reads best on this color (12.17:1).
About this color
#51DD9D is a light, vivid green. In OKLCH its lightness is 81%, its chroma 0.152 and its hue 160°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Aqua Green (#12E193), ΔE 0.030 away. Black text reads best on it, at 12.17:1.
| Hue family | Greens |
| Lightness | light (81%) |
| Chroma | vivid (0.152) |
| Temperature | in between |
| Nearest name | Aqua Green (#12E193) |
| Black text | 12.17:1 |
| White text | 1.72:1 |
Values
| HEX | #51DD9D |
| RGB | rgb(81, 221, 157) |
| HSL | hsl(153, 67%, 59%) |
| OKLCH | oklch(80.5% 0.152 160) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #51DD9D | 1.72:1 | Fails | Lc -34.6 | Non-text elements, placeholder text |
| Black text on #51DD9D | 12.17:1 | AAA | Lc 73.1 | Content text, not long reading |
| #51DD9D text on white | 1.72:1 | Fails | Lc 30.8 | Non-text elements, placeholder text |
| #51DD9D text on black | 12.17:1 | AAA | Lc -72.0 | Content text, not long reading |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 300.
-
Step 50
50
#EAFAF1
oklch(97.1% 0.021 161.5)
-
Step 100
100
#D2F4E0
oklch(93.7% 0.044 159.6)
-
Step 200
200
#A8EBC6
oklch(88.5% 0.085 159.9)
-
Step 300
300 (this color)
#51DD9D
oklch(80.5% 0.152 160)
-
Step 400
400
#00BE7D
oklch(70.7% 0.16 159.9)
-
Step 500
500
#00A36B
oklch(63.1% 0.143 160.1)
-
Step 600
600
#008959
oklch(55.6% 0.126 160)
-
Step 700
700
#00734A
oklch(49% 0.111 160)
-
Step 800
800
#005F3C
oklch(42.8% 0.097 159.8)
-
Step 900
900
#004F31
oklch(37.7% 0.086 159.7)
-
Step 950
950
#002F1C
oklch(26.9% 0.06 160.5)
#51DD9D with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #DACD99 | 0.143 |
| Deuteranopia (no green cones) | #C8C0A1 | 0.139 |
| Tritanopia (no blue cones) | #00DCCC | 0.066 |
| Achromatopsia (no color) | #C5C5C5 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51DD9D
#51DD9D
oklch(80.5% 0.152 160)
- #FF97DE
#FF97DE
oklch(80.6% 0.15 340)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #51DD9D, closest first.
No curated palette has a color within ΔE 0.04 of #51DD9D.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Green #12E193 ΔE 0.030
- Emerald #06D6A0 ΔE 0.034
- Aqua Marine #2EE8BB ΔE 0.041
- Weird Green #3AE57F ΔE 0.052
- Medium Aquamarine #66CDAA ΔE 0.055
- Seaweed #18D17B ΔE 0.058
- Seafoam Blue #78D1B6 ΔE 0.063
- Turquoise #40E0D0 ΔE 0.067
Use #51DD9D in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.